Expansion assembly for MIMO system

Abstract

The disclosure provides an expansion assembly configured to increase a transmitting distance of a MIMO system, the expansion assembly comprises N first RF front end units, N second RF front end units, a first power divider and combiner, and a second power divider and combiner. The first power divider and combiner connects with each of the first RF front end units, for delivering a first signal polarized in a first direction to the each of the first RF front end units. The second power divider and combiner connects with each of the second RF front end units, for delivering a first signal polarized in a first direction to the each of the second RF front end units. Accordingly, the first and second signal polarized in a second directions are capable of being transmitted in different directions, so as to implement the omni-directional transmission and increase the transmission distance.

What is claimed is: 
     
       1. A expansion assembly comprising:
 N first radio frequency (RF) front end units connected with a first port in each of N antennas, wherein each of the first RF front end units processes a first signal polarized in a first direction, where N is an integer; 
 N second RF front end units connected with a second port in each of the antennas, wherein each of the second RF front end units processes a second signal polarized in a second direction; 
 a first power divider and combiner configured to deliver and combine the first signal polarized in a first direction, the first power divider and combiner connected with each of the first power RF front end units; and 
 a second power divider and combiner unit configured to deliver and combine the second signal polarized in a second direction, the second power deliver divider and combiner unit connected with each of the second power RF front end units. 
 
     
     
       2. The expansion assembly according to  claim 1 , further comprising:
 a first switching unit, connected with the first power divider and combiner, wherein the first switching unit is controlled for transmitting or receiving of the first signal polarized in a first direction; and 
 a second switching unit, connected with the second power divider and combiner, wherein the second switching unit is controlled for transmitting or receiving of the second signal polarized in a second direction, 
 wherein a node between the first switching unit and the second switching unit being connected with each of the first power RF front end units and each of the second power RF front end units, so as to control the transmitting and the receiving of the first and second signal polarized in a second directions. 
 
     
     
       3. The expansion assembly according to  claim 1 , wherein each of the first and the second RF front end units comprises a power amplifier and a low-noise amplifier. 
     
     
       4. The expansion assembly according to  claim 1 , wherein each of the antennas is a dual-polarized antenna. 
     
     
       5. The expansion assembly according to  claim 1 , wherein each of the antennas transmits or receives signals in different spatial domains. 
     
     
       6. The expansion assembly according to  claim 5 , wherein a combination of the spatial domains covers 360 degrees. 
     
     
       7. The expansion assembly according to  claim 6 , wherein the first power divider and combiner comprises a plurality of first power dividing and combing parts, and the second power divider and combiner comprises a plurality of second power dividing and combing parts. 
     
     
       8. The expansion assembly according to  claim 7 , wherein the number of the plurality of first power dividing and combing parts is three, and the number of the plurality of second power dividing and combing part is three. 
     
     
       9. The expansion assembly according to  claim 8 , wherein one of the plurality of first power dividing and combing parts connects with other two first power dividing and combing parts, and wherein one of the plurality of second power dividing and combing parts connects with other two second power dividing and combing parts. 
     
     
       10. The expansion assembly according to  claim 8 , wherein the number of the antennas is four.